Java 文件操作类（操作目录）

·列出目录下的信息：public String[ ] list（）;

·列出所有的信息以File类对象包装：public File [ ] listFiles（）;

范例1：列出信息

import java.io.File;

public class Demo {
	public static void main(String[] args) throws Exception {
		File file = new File("e:" + File.separator);
		if (file.isDirectory()) {
			String result[] = file.list();
			for (int x = 0; x < result.length; x++) {
				System.out.println(result[x]);
			}
		}
	}
}

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范例2：列出全部File类对象

import java.io.File;

public class Demo {
	public static void main(String[] args) throws Exception {
		File file = new File("e:" + File.separator);
		if (file.isDirectory()) {
			File result[] = file.listFiles();
			for (int x = 0; x < result.length; x++) {
				System.out.println(result[x]);
			}
		}
	}
}

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范例3：列出指定目录下的子路径

import java.io.File;

public class Demo {
	public static void main(String[] args) throws Exception {
		File file = new File("e:" + File.separator);
		print(file);
	}

	public static void print(File file) {
		if (file.isDirectory()) {
			File[] result = file.listFiles();
			if (result != null) {
				for (int x = 0; x < result.length; x++) {
					print(result[x]);
				}
			}
		}
		System.out.println(file);
	}
}